<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://unpkg.com/vue@next"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
        <runoob-a></runoob-a>
    </div>
    <script>
     
    var runoobA = {
      template: '<h1>11!</h1>'
    }
     
    const app = Vue.createApp({
      components: {
        'runoob-a': runoobA
      }
    })
     
    app.mount('#app')
    </script>
</body>
</html>